{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-80886",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.799Z",
        "datePublished": "2026-09-04T16:49:35.864Z",
        "dateUpdated": "2026-09-04T16:49:35.864Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-09-04T16:49:35.864Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: msm: Disable DMA for kernel console UART\n\nAt the moment, concurrent writes from userspace and the kernel to the\nconsole can trigger a race condition that results in an infinite loop of\nthe same messages printed over and over again. This is most likely to\nhappen during system startup or shutdown when the init system starts/stops\na large number of system services that interact with various kernel code.\n\nWhen userspace writes to the TTY device, the driver initiates an\nasynchronous DMA transfer and releases the port lock. At the same moment,\nthe kernel printk path might grab the port lock and re-configure the UART\ncontroller for PIO, without waiting for the DMA operation to complete. It\nseems like this collision results in zero progress being reported for the\nDMA engine, so the same text is printed to the console over and over again.\n\nFor the kernel console, we want a reliable output path that will be\nfunctional even during crashes etc. So rather than implementing complex\ncode to synchronize the kernel console write routines with the userspace\nDMA write routines, simply disable DMA for the console UART instance.\n\nSimilar checks exist in many other serial drivers, e.g. 8250_port.c,\nimx.c, sh-sci.c etc."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/tty/serial/msm_serial.c"
                    ],
                    "versions": [
                        {
                            "version": "3a878c430fd6eb4f8587f9ebd187f773bf85d1d6",
                            "lessThan": "f58e568dc308c8e13f7730c8de2da5ed514e540d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a878c430fd6eb4f8587f9ebd187f773bf85d1d6",
                            "lessThan": "bb4296de5b538b575978c588cb3738ab8524d01a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a878c430fd6eb4f8587f9ebd187f773bf85d1d6",
                            "lessThan": "6acea62738ed4cae6746483026706a773b44dad7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a878c430fd6eb4f8587f9ebd187f773bf85d1d6",
                            "lessThan": "abc1926c88c189e5d698b91ed6890e09ab5c321d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a878c430fd6eb4f8587f9ebd187f773bf85d1d6",
                            "lessThan": "2727744ccb5ca59090451451ee94f530b1be04a5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a878c430fd6eb4f8587f9ebd187f773bf85d1d6",
                            "lessThan": "d354716245192de2d203f2b35f22ab8dc13595e2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a878c430fd6eb4f8587f9ebd187f773bf85d1d6",
                            "lessThan": "e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3a878c430fd6eb4f8587f9ebd187f773bf85d1d6",
                            "lessThan": "22dd2777e6c180e1c945b00f6d18550979436324",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/tty/serial/msm_serial.c"
                    ],
                    "versions": [
                        {
                            "version": "4.4",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.4",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.261",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.212",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.178",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.145",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.97",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.40",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4",
                                    "versionEndExcluding": "5.10.261"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4",
                                    "versionEndExcluding": "5.15.212"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4",
                                    "versionEndExcluding": "6.1.178"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4",
                                    "versionEndExcluding": "6.6.145"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4",
                                    "versionEndExcluding": "6.12.97"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4",
                                    "versionEndExcluding": "6.18.40"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4",
                                    "versionEndExcluding": "7.1.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f58e568dc308c8e13f7730c8de2da5ed514e540d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/bb4296de5b538b575978c588cb3738ab8524d01a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6acea62738ed4cae6746483026706a773b44dad7"
                },
                {
                    "url": "https://git.kernel.org/stable/c/abc1926c88c189e5d698b91ed6890e09ab5c321d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2727744ccb5ca59090451451ee94f530b1be04a5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d354716245192de2d203f2b35f22ab8dc13595e2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47"
                },
                {
                    "url": "https://git.kernel.org/stable/c/22dd2777e6c180e1c945b00f6d18550979436324"
                }
            ],
            "title": "serial: msm: Disable DMA for kernel console UART",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}